Switching from NPH Insulin to 70/30 Insulin
Conversion Process
- The American Diabetes Association recommends calculating the total daily dose of 70/30 insulin as 80% of the current NPH insulin total daily dose, dividing it into two daily injections, with 2/3 of the total daily dose given before breakfast and 1/3 before dinner 1
- The conversion process involves administering 70/30 insulin twice daily, with the total daily dose equal to 80% of the previous NPH dose, typically dividing as 2/3 before breakfast and 1/3 before dinner, as recommended by the American College of Clinical Endocrinologists 1
Monitoring and Adjustment
- The American Association of Clinical Endocrinologists recommends checking blood glucose levels more frequently during the transition period and monitoring both fasting and postprandial glucose levels to assess the effectiveness of the new regimen 1, 4
- Target fasting glucose values should be between 4.0-7.0 mmol/L (72-126 mg/dL), according to the American Diabetes Association 4
Clinical Considerations
- The American College of Clinical Endocrinologists notes that 70/30 insulin provides both basal and prandial coverage with fewer daily injections, simplifying the regimen compared to separate basal and bolus injections 2, 3, 5
- However, 70/30 insulin may have less flexibility in dosing compared to basal-bolus regimens and may not provide optimal coverage for variable meal timing or content, as stated by the American Association of Clinical Endocrinologists 3, 5
Special Considerations
- The American Diabetes Association recommends monitoring closely for hypoglycemia during the transition period, especially at night, and considering reducing the dose if A1C is <8% when switching to avoid hypoglycemia 1
- More consistent meal timing is important with premixed insulin regimens, according to the American College of Clinical Endocrinologists 3